adding days oddity - repeated date!

jpmoriarty

i'm doing a calendar function for a site of mine - have come across somethign very strange: it's repeating a day. here's the code:

<?
$day = date("d");
$month = date("m");
$year = date("Y");
$num_days = 7;
for($d=0;$d<$num_days;$d++)
{
	$newdate = mktime(0,0,0,$month,$day+$d,$year);
	echo "<b>".date("l j F, Y",$newdate)."</b><br>\n";
	echo "<i>There are no entries for this date</i><br><br>\n";
}
?>

I've got rid of the sql malarkey that was in there.

The output i'm getting though gives the dates 28, 29, 29, 31, 1, 2, 3 - if i change the num_days to 100, then everything up the 100th is fine, just still that 2nd and 3rd value are the same.

Friday 28 March, 2003
There are no entries for this date

Saturday 29 March, 2003
There are no entries for this date

Saturday 29 March, 2003
There are no entries for this date

Monday 31 March, 2003
There are no entries for this date

Tuesday 1 April, 2003
There are no entries for this date

Wednesday 2 April, 2003
There are no entries for this date

Thursday 3 April, 2003
There are no entries for this date

Can someone try it on their system to check that the code is okay, and if it is suggest what it might be that's happening on mine? If there's a prob with the code then if you could point that out i'd be very grateful!

(edit) i've just tried changing the date to earlier in the week, and it seems to be on the 30th that it struggles (and keeps repeating the 29th) - how odd!

dalecosp

That does seem a bit weird.

A direct cut-n-paste to one of my boxen (FreeBSD, Apache 1.3.27, mod_php 4.2.3) gave the expected results rather than repeating the 29th....

What about your OS, your PHP version. Or your CPU core voltage, heh....

😕

barand

No problem either with Win98SE, PWS and php4.1.1

Weedpacket

Um, Win95, [no server], PHP4.3; works fine here. Bounced my system clock around the year for a bit trying to catch it out, but no; a whole year works out right.

Thought for a few seconds that it might be a Daylight Saving issue , but no; that wouldn't be it - it's what I would suspect it if the code assumed all days were 86400 seconds long. Say daylight saving began at 2am on the morning of the 29th. Midnight on the start of that day would be the 29th; 24 hours later it would still be the 29th (11pm, in fact).

But no. That's not the problem. On the one hand, the dates given would have gone 28, 29, 29, 30, 31; on the other hand, the code isn't making that 86400-seconds-per-day assumption; and on the gripping hand, your local territory and system might not even be starting Daylight Saving on that date.

mktime(0,0,0,3,28+2,2003) should display as March 30...

All in all, odd indeed.

Incidentally, what does date("l j F, Y", mktime(0,0,0,3,30,2003)) produce? Or date("l j F, Y", mktime(3,3,3,3,30,2003)) for that matter?

jpmoriarty

ah ha, think you've hit the nail on the head now. I tried those two mktime()'s, and i got this:

Saturday 29 March, 2003
Sunday 30 March, 2003

so it must be a GMT / BST thing. Im using apache 2 (which i'm not sure is allowed technically yet, but there you go) on win XP home and PHP 4.3.0.

At least i know its not the code though - when i move it to my hoster it shouldnt be a problem since they're in the US. I wonder whether its an apache thing then or php or what??

But thanks for the help anyway guys.